Mechanism for converting rotary motion to reciprocatory motion



AND MiLUH/XNISMS May 5, 1942.

Filed Dec. 27, 1940 "Fig. I

F. TOOP Search Room 5 Sheets-Sheet 1 lnncntor FREDERICK TOOP Gttorueg Search Room F. TOOP May 5, 1942.

MECHANISM FOR CONVERTING ROTARY MOTION TO RECIPROCATORY MOTION Filed Dec. 2'7, 1940 3 Sheets-Sheet 2 Snncntor FREDERICK TOOP Bu N I W Gflorneg 1 18511 ma nwuul May 5, 1942. F. TOOP 2,281,641

MECHANISM FOR CONVERTING ROTARY MOTION TO RECIPROCATORY MOTION Filed Dec. 27, 1940 3 Sheets-Sheet 3 mm m mm mm Gttorueg a FREDERICK TOOP 74. MACHINE ELEFv'iEN'I'S AND MECHANISMS Patented May 5, 1942 Search Room UNITED STATES PATENT OFFICE MECHANISM FOR CONVERTING ROTARY MOTION TO RECIPROCATORY MOTION 4 Claims.

This invention relates to mechanism for converting rotary motion to reciprocatory motion, and more particularly to portable power producing and transmitting machines of the type shown and described in my United States Letters Patent Numbered 2,220,871 and 2,220,872, granted November 5, 1940.

Some tools are so delicate in their operation that when used with power operating machines of the type shown in the above referred to patents, the single actuating members of the machines cause shocks at each end of their reciprocative movements which prevent precision work and smooth operation of the tools.

Also, it has been found that the machines of the type shown in the above referred to patents are not adapted for use with many types of tools in the desired manner, on account of the single reciprocative movements of the actuating members.

An object of the present invention is to provide an improved mechanism for converting rotary motion to reciprocatory motion, in which the reciprocatory motion is produced by a pair of reciprocative members operatively connected to the shaft of a motor in such a manner as to be simultaneously reciprocated in opposite directions.

Another object of the invention is to provide an improved mechanism for converting rotary motion to reciprocatory motion, in which a pair of tool actuating members are reciprocated by a motor driven shaft having means thereon to effect simultaneous reciprocative motion of the actuating members in opposite directions.

Another object of the invention is to provide an improved mechanism for converting rotary motion to reciprocatory motion in which reciprocatory movements in opposite directions are simultaneously produced by a pair of members which are operated by a shaft having a pair of eccentrically positioned elements mounted within openings formed in the reciprocative members.

Another object of the invention is to provide an improved machine of the above type in which a plurality of reciprocative movements are simultaneously produced by members operatively connected to the shaft of a motor in such a manner that shocks occurring at the ends of the movements of the members are neutralized.

With these and other objects in view, the invention comprises novel features of construction and combinations of elements which will be hereinafter described and claimed.

In the accompanying drawings:

Figure 1 is a side elevation of a portable machine embodying the present invention and having one type of tool attached in its operative relation;

Fig. 2 is an enlarged elevation, partly in section, of a portion of the machine shown in Fig. 1, the reciprocative members being shown at their innermost reciprocative position:

Fig. 3 is a vertical section taken on the line 3-3 of Fig. 2, the elements of the tool being omitted;

Fig. 4 is a view similar to Fig. 2 showing the reciprocative members of the machine at their extreme outermost reciprocative position;

Fig. 5 is a view similar to Fig. 3 showing the reciprocative members at their extreme outermost reciprocative position;

Fig. 6 is a transverse section taken on the line 6-6 of Fig. 3;

Fig. 7 is a transverse section taken on the line 1-1 of Fig. 3;

Fig. 8 is a perspective view of one of the reciprocative members;

Fig. 9 is a perspective view of the other reciprocative member, and

Fig. 10 is a side elevation of the operating shaft for the reciprocative members.

Referring to the drawings, an electric motor of any appropriate type or kind (not shown), with the exception of the front end portion of the motor shaft, is mounted within a casing having a main part II and an end portion l2 formed with an enlarged portion l3 to receive a housing I4 for the operating mechanism of the present invention.

The end of the casing ll opposite to the end having the portion l2 carries a handle IS with its controlling switch I6 and power connecting terminals H for the electric motor.

The housing I4 is removably secured to the portion l3 of the casing by screws [8 (Fig. 6), or by any other appropriate means, and the portion I! of the casing may be removably secured to the portion H by any appropriate means (not shown); The housing M has a closure 20 removably secured to the front end thereof by screws 2| (Fig. 7).

The closure 20 is formed on its inner or rear side with parallel guides 22 (Fig. 6), between which are disposed two reciprocative members 23 and 24.

The parallel guides 22 engage the side edges of the members 23 and 24 and thereby prevent relative movement of these members except in a straight line, normally upward and downward or towards and from a tool supporting element or socket formed in a boss 26 or extension of the housing l4, as shown in Figs. 2, 3, 4 and 5.

The reciprocative member 23 is formed with an opening 21 which is made elongated transversely of the longitudinal center line of said member, as shown best in Fig. 8.

An opening 28, similar to the opening 21, is formed in the reciprocative member 24, as shown best in Fig. 9.

The member 24 is slidably mounted on the member 23, as shown in Figs. 2, 3, 4 and 5, and said member 24 is formed with a socket or element 29 adapted to receive a spherical end portion 38 of an arm 3| of a tool 32, for operation of the latter as hereinafter described. The arm 3| is adapted to extend through an opening 33 formed in the closure 20.

The reciprocative member 23 is constructed somewhat longer than the reciprocative member 24 and the end of the member 23 nearest the socket 25 is formed with a lateral extension or offset portion 34. a

The portion 34 is formed with a socket or element 35 adapted to receive a spherical end porporting member 39 preferably made integral with I the portion |2 of the casing and extending from the inner portion of said casing, as shown in Figs. 2 and 4, towards the closure 20.

As shown in Fig. 8, the portion 34 of the member 23 provides a broad bearing surface adapted to engage the inner face of the closure 20 to thereby constitute a sliding guide for the member 23. In other words, the member 23 is slidably mounted between the closure 28 and the supporting member 39 and is thus held from lateral shifting movement therebetween. The member 34 also has another purpose, in that it functions as means for closing the exposed portion of the opening 38 in the closure 20 (see Figs. 2 and 4).

Formed on the extremity of the motor shaft 48 is a gear 4| which has teeth in meshing relationship with the teeth of a gear 42.

The gear 42 is fixed to a shaft 43, journalled at one end in a bearing 44 mounted in the casing l3, as shown in Fig. 2.

The shaft 43 extends through the openings 21 and 28 of the reciprocative members 23 and 24, respectively, and also through a journal or hearing 45 formed in the closure 20.

A washer 54 is mounted on the shaft 43, and said washer is interposed between the reciprocative member 23 and the gear 42 so as to support the end of the member 23 opposite to the end supported by the member 39.

Formed on the shaft 43 is a pair of eccentrically positioned elements 46 and 41 adapted to move in the openings 21 and 28, respectively, of the reciprocative members 23 and 24.

In order to prevent undue wear of the eccentrics 46 and 41, said eccentrics are fitted with bearings or bushings 48 and 49, respectively, said bushings being preferably arranged concentric of said eccentrics, as shown. In Figs. 2 and 4 the bushings are shown on their respective eccentrics, and in Fig. 10 the bushings have been omitted from the eccentrics.

The eccentrics 46 and 41 are diametrically disposed with respect to the longitudinal center line of the shaft 43, the eccentric 46 extending laterally in one direction from the center of said shaft and the eccentric 41 extending laterally from the center of the shaft in the direction opposite to said eccentric 46. Both eccentrics and their respective bushings are circular in outline and the maximum diameter of the bushings is substantially equal to the minimum width of the openings 21 and 28, as shown in Fig. 3.

The contours of the openings 21 and 28 and the arrangement of the eccentrics 46 and 41 are such that the reciprocative members 23 and 24, which are disposed between the guides 22, move in a straight line across the axis of the shaft 43.

The extremity of the shaft 43 may be provided with a knob 50, and if so desired said knob may be detachably connected to said shaft in any convenient manner, such as by a bayonet-slot 55, as shown in Fig. 10.

In order to show one use for which the power producing mechanism has been designed, I have chosen the tool 32. This tool has a base member 56, from which projects an arm 51.

The arm 51 is made rigid with the base 56 and the outer portion 58 of said arm is adapted to be mounted in the socket 25 so that the tool will be rigidly connected with the casing In order to detachably connect the tool 32 to the power device, the portion 58 of the arm 51 is formed with a transverse slot or groove 59 adapted to receive the shank 60 of a spring pressed locking-pin 6 l.

The locking-pin 6| is mounted in the boss 26 and arranged transversely of the device so as to extend across a portion of the socket 25.

In order to permit the insertion of the end 58 into the socket 25 and the withdrawal of the arm from said socket without the necessity of removing the locking pin 6| from the device, said pin has a notch 62 formed in the portion of its shank 60 which normally extends across the socket opening 25. The contour of the notch 62 is such that when the pin 6| is turned to the position shown in Fig. 3, the full area of the socket opening 25 will be provided for the insertion or the withdrawal of the arm portion 58. After the arm i mounted in the socket 25, as shown in Fig. 2, the pin 6| is adapted to be rotated to the position in which the notch 62 is moved out of registration with the opening of the socket 25. In such position, the main shank portion 60 of the pin 6| will be disposed in the groove 59, thereby preventing movement of the arm 58 relative to the housing I4. In this way the tool 32 will be rigidly connected to the power device.

The pin 6| is held in either of the two positions referred to above by a coil spring 63 mounted in a recess 64 and encircling an end of the pin, said spring hearing at one end against a shoulder 65 and at the other end against a washer or disk 66 mounted on the extremity of said pin. The action of the spring 63 normally retains the operating head 61 of the pin 6| in engagement with a shoulder 68. The head 61 is formed with a lug 69 adapted to engage the shoulder 68 when the pin 6| is in the position shown in Fig. 2.

The arm 3| is pivotally mounted on the tool 32, as indicated at 10, and said arm carries a cutting element 1| adapted to cooperate with a cutting element 12 carried by the arm 31 to produce a shearing action. The arm 31 is also piiavogally mounted on the tool 32, as indicated a The disposition of the eccentrics 46 and 41 with respect to the axis of rotation of the shaft 43 and the manner in which said eccentrics are 74. MACHINE ELEMEM'S AND MEG! IANlSMS Sear h figgm arranged in the reciprocative members 23 and 24, is such that said members will be moved simultaneously in opposite directions when the shaft 43 is rotated. The reciprocating movement of the members 23 and 24 in opposite directions imparts a similar movement to the arms 3| and 31, so that said arms will be alternately moved toward and away from each other. In this way the cutting elements II and 12 will be operated and having two eccentrics thereon mounted re spectively within the openings of said reciprocative members, said eccentrics being located at diametric points with respect to the longitudinal center line of said shaft so that said members will be simultaneously operated to move the movable tool members in opposite directions with respect to said rigid tool member.

2. In a machine of the type described, the como p du the desired Shearing a bination of a motor including a motor shaft and By p vidin m ans, such as h element 5. also including a casing which has a tool attachfo re a n t e tool id w th the motor cas ing element at its front end, said tool attaching n a d y p v di s, su h as the r element being adapted to engage with and supciprocative members 23 and 24, for simultaneoust a rigid m mber of a, tool that comprises a y Operating the tool s 3 and the shock pair of movable members pivotally connected to which occurs at the end of each reciprocative movement of the tool arms is neutralized, with the result that the tool is operated more smoothl than when a single reciprocative member is the rigid member for cooperation in performing the tools function, a separate actuating member for each of said movable members, each actuating member having means for operatively conp y s h as the reciprocative members of necting a movable member of said tool thereto, y two above referred to p and power transmitting means operatively cont l be Understood that in t Case Of a nected to each of said actuatin members and to le reciprocative member Operated at Consider said motor shaft so as to effect simultaneous reable speed, first in one direction, and then in the ciprogative movements of Said actuating pp direction, t e suddenn ss Wh t e s nbers in opposite directions to thereby effect opergle reciprocative member C a es its direction of ation and function of said tool by the operation movemen causes a pr n u e sh k in th o of said motor, said front end of the casing being erathlg mechanism. d o in the mechanism inclusive of a removable closure that is provided pe a d t y 0n t e o e a d since both with parallel guides, said actuating members beof e procative members 23 and 24 reve se ing slidably seated between said guides in a their direction of movement simultaneously, the proper r l ti for having reciprocative motion s o at e n balances e shock at the D- towards and from said rigid tool attaching ele- D e d es t n fro the change in direcment, said power transmitting means being intion of movement, so that little or no vibration elusive of a haft th t has means thereon to or shock is produced in the oper meehfleffect said simultaneous reciprocative motion of nism and the mechanism Operated thereby. said actuating members in opposite directions. Thus, the simultaneous double reciprocative ac- 3 I a hi of th typ described, the t o in pp s e directions f e members 23 combination of a motor including a motor shaft and 24 produces a mechanical movement simud also including a casing which has a tool latin som what th smoo h m ti n p u by attaching element at its front end, said tool ata balanced wheel. For instance, after the memtaching lement being adapted to engage with bers 23 and 24 have attained their normal operand su port a rigid member of a tool that comatin peed, h reciprocative movements of Said prises two movable members pivotally connected members continue for a considerable period of t th t for cooperation i performing th time after the current ppli o the driving tools function, a separate actuating member for motor has been cut oil. That is to say. t arms each of said movable tool members, each actuat- 3l and 31 are actuated approximately three times ing member having means for operatively conl er han s he se Where a single necting a movable member of said tool thereto, cative member is empl y d s referred to in my and power transmitting means operatively conorior patents. Another feature of the prese nected to each of said actuating members and to invention is that the d u l action of the We said motor shaft so as to effect simultaneous remembers 23 and 24 is obtained y the use of a ciprocative movements of said actuating memsi le p i g shaft and gear drive thereforbers in opposite directions to thereby effect op- The amount of reciproc o y ion mparted eration and function of said tool by the operation to the members 23 and 24 by the shaft 43 can be of said m observed by comparing the p s ion f e parts 4. In a machine of the type described, the comshown in Figs- 2 a d th t Position of the bination of a motor including a motor shaft and same parts in Figs. 4 and espe y. also including a casing which has a tool attach- Havin t us described y invention, What I ing element at its front end, said tool attaching claim is: element being adapted to engage with and sup- 1. In a mechanism f r o v i ry port a rigid member of a tool that comprises two tion to reciprocatory motion, the combination of movable members pivotally connected to the tool a motor including a motor shaft and al o inol dfor cooperation in performing the tool's function, ing a, casing which has a tool attaching element a separate actuating member for each of said at its front end, said tool attaching element being movable tool members, each actuating member adapted to engage with and support a rigid memhaving means for operatively connecting a movber of a tool that comprises a pair of movable able member of said tool thereto, a shaft operamembers pivotally connected to the rigid member tively connected to said motor shaft, and means for cooperation in performing the tools function, carried by said shaft and operatively connected a, pair of members mounted in said casing for reto each of said actuating member so as to effect ciprocative strokes, each reciprocative member simultaneous reciprocative movements of said achaving means for operatively connecting a movtuating members n pp e directions o thereable member of said tool thereto, an opening by effect pe a o d function of sa d t ol y formed in each reciprocative member. and a the operation f Said rshaft cper'atively connected with said motor shaft 76 ms wnnmrw r nnn 

